Jonathan O'Loughlin

State Trooper Jonathan O'Loughlin testified for the Commonwealth on Day 6 about photographing and processing the secured scene at 47 Summer Street in Duxbury on January 24, 2023. He explained that documentation began after the signed search warrant arrived and was photographed, and distinguished photographic placards from laboratory evidence numbers.

O'Loughlin described fingerprint processing and explained why it precedes biological testing. He reported insufficient fingerprint detail for comparison on the knife and the yellow, black, and blue exercise bands. During his testimony, the judge admitted photographs of the knife and cellphone and admitted the knife as Exhibit 179. Three photographs documenting a brown journal's location were also admitted. O'Loughlin placed the dresser in the basement and said that, to his knowledge, the state police detective unit collected the journal.

On cross-examination, Kevin Reddington questioned his training and emphasized his agreement that he obtained no fingerprints. O'Loughlin described fingerprint certification as usually requiring about a year of internal training, rather than attendance at a specific school. He clarified that his responsibility was documenting evidence, not searching for items. His agreement that he would photograph a hypothetical discovery involving additional drugs, blood, and a knife did not establish that those drugs were found. The judge sustained a defense follow-up about the fingerprint result. The Commonwealth declined redirect, and O'Loughlin was excused.